WASI problem

[Rui-Gan]

I am trying to compile the eKuiper project(https://github.com/lf-edge/ekuiper) to Wasi and then use wasmedge to run the compiled binary file. I used TinyGo to compile eKuiper to Wasi, but encountered issues.

When I ran the command below to compile eKuiper to Wasi:

tinygo build -o kuperd.wasm -target wasi cmd/kuiperd/main.go

I received the following error message:

# golang.org/x/sys/unix
../../../go/pkg/mod/golang.org/x/[email protected]/unix/syscall_linux.go:1901:64: undefined: syscall.Rlimit
../../../go/pkg/mod/golang.org/x/[email protected]/unix/syscall_linux.go:1906:50: undefined: syscall.Rlimit
../../../go/pkg/mod/golang.org/x/[email protected]/unix/syscall_linux.go:1906:79: undefined: syscall.Rlimit
../../../go/pkg/mod/golang.org/x/[email protected]/unix/syscall_unix.go:595:17: undefined: syscall.Setrlimit
../../../go/pkg/mod/golang.org/x/[email protected]/unix/syscall_unix.go:595:47: undefined: syscall.Rlimit

I am not sure what causes this error and would appreciate any help. I would like to know why this issue occurs and how to resolve it.

[HarikrishnanBalagopal]

syscall.Rlimit

Resource limit I think https://pkg.go.dev/syscall#Rlimit
https://pkg.go.dev/syscall#Setrlimit
https://linux.die.net/man/2/setrlimit

[aykevl]

This error message means that you are (directly or indirectly) importing golang.org/x/sys, which as you see isn't currently supported. Hopefully it will be once we switch to GOOS=wasip1 support (we currently use linux/arm for lack of real WASI support in the Go standard library).

[Rui-Gan]

Thanks for your reply,

[aykevl]

Also see: #3861

[maggie44]

Did you find a way to track down the package that was causing the issue? I am not building WASI, just the standard tinygo build but the same issue:

vendor/golang.org/x/sys/unix/syscall_unix.go:603:17: undefined: syscall.Setrlimit
vendor/golang.org/x/sys/unix/syscall_unix.go:603:47: undefined: syscall.Rlimit

Can't track which package is trying to call it though.

[aykevl]

You can try tinygo list -deps -json -target wasi and inspect the output.

[inliquid]

Also encountered this issue with some gRPC (proto definitions) dependencies.

[aykevl]

You can try GOOS=wasip1 GOARCH=wasm tinygo ... instead of tinygo -target=wasi. This means we use the standard library WASI support instead of our custom variant, which might get more code to compile.

[inliquid]

Thank you, will this approach become a standard way of compiling to WASI at some point?

[aykevl]

Yes. It only works in Go 1.21+ and right now we support Go versions down to Go 1.18 so I think we should wait a bit before changing the default.